The Rheoline Multi-Function Rheometer utilizes a new generation In-line Servo Motor coupled with digital servo drive technology, together with our Labline Software provides has fantastic flexibility and provides a wide spread of test conditions with an ‘Unlimited’ amount of ‘Test Method’ specifications.
The Multi-Function Rheometer is capable of fulfilling tasks of both a Moving Die Rheometer (MDR)and a Dynamic Shear Rheometer (DSR). The instrument can be used firstly at lower temperatures and frequencies to study the process of polymers, secondly as a standard MDR and thirdly as a dynamic mechanical analyser to evaluate the cured properties of materials. See modes of operation.
The temperature control of the dies is better than its rivals, giving an impressive variation of +/- 0.03 degrees from the set point.
This instrument comes complete with an ‘Air Cooling System’ as standard to assist the operation of a ‘Temperature Sweep’.
The response of a specimen to a sinusoidal deformation can best exhibit the dynamic properties of an elastomer. The elastic component of the elastomer is responsible for the in-phase stress, while the viscous component is responsible for the out-of-phase stress. The amount by which the strain response lags the resultant of the two stresses (in-phase and out-of-phase) is known as the phase or loss angle, δ. The more viscous an elastomer is, the greater the phase or loss angle. The tangent of this angle “tan δ,” in the simplest terms, is the ratio of the viscous modulus to the elastic modulus.
It is strongly recommended that samples are prepared with an automatic Volumetric Sample Cutter. Rheoline VSC Volumetric Sample Cutter
Modes of Operation
The instrument comes with a set of pre-programmed tests and allows full flexibility giving the user complete control of the test stages. Tests can be in the form any of its modes of operation or a combination.
- Frequency Sweep
- Strain Sweep
- Temperature Sweep– with cooling
- Standard MDR mode
- Pre-set test Specifications
|Elastic Torque, S′
The peak amplitude torque component which is in phase with a sinusoidal applied strain.
|Loss Shear Modulus, G′′
The ratio of (viscous) peak amplitude shear stress to peak amplitude shear strain for the torque component 90° out of phase with a sinusoidal applied strain.
Mathematically, G′′ = [(S′′/Area)/Peak Strain]
|Viscous Torque, S′′
The peak amplitude torque component which is 90° out of phase with a sinusoidal applied strain.
|Complex Shear Modulus, G*
The ratio of peak amplitude shear stress to peak amplitude shear strain.
Mathematically, G* = [(S*/Area)/Peak Strain] = (G′² + G′′²)^1/2
|Complex Torque, S*
The peak amplitude torque response measured by a reaction torque transducer for a sinusoidal applied strain. Mathematically, S* = (S′² + S′′²)^1/2
|Loss Factor, Tan delta
The ratio of loss modulus to storage modulus,or the ratio of viscous torque to elastic torque.
Mathematically, tan delta = G′′/G′ = S′′/S′
|Loss Angle, delta
The phase angle by which the complex torque (S*) leads a sinusoidal applied strain.
|Dynamic Complex Viscosity, n*
The ratio of the complex shear modulus, G*, to the oscillation frequency in rads/sec.
|Storage Shear Modulus, G′
The ratio of (elastic) peak amplitude shear stress to peak amplitude shear strain for the torque component in phase with a sinusoidal applied strain.
Mathematically, G′ = [(S′/Area)/Peak Strain]
|Real Dynamic Viscosity, n′
The ratio of the loss shear modulus, G′′, to the oscillation frequency in rads/sec.
|Die System:||Bi-conical, fully sealed|
|Die Gap:||0.45mm nominal|
|Torque Device:||Reaction transducer in upper platen|
|Torque Range:||0 to 200 dNm|
|Strain Range:||1% to 1250%|
|Frequency Range:||0.01Hz to 40 Hz|
|Calibration Device:||Torsion spring|
|Closing System:||Soft closing to reduce breakage of film and distortion of sample|
|Drive System:||In line servo-motor and Aerotech digital controller|
|Fitted Cooling System:||Yes|
|Electrical:||Single Phase 220/240V 50HZ, 110v 60Hz.|
|Pneumatics:||Filtered air, 4.2 Kg/cm, (60 psi)|
|Units of Measurement:||
|Dimensions:||575 mm x 570 mm x 1280 mm W x D x H)|
|PC Specification:||Pentium processor & networked|
|Software:||Labline (Unlimited Test Methods)|
|Data Format:||All data stored in accessible format allowing easy. Export to all other packages.|
|Optional Extras Available:||Auto-loading Module (4/16 samples)
Volumetric MDR Sample Cutter